Is it possible to fetch the items in a user's shopping cart?

I want to have an option in my game where you can input your user id and it will prompt you a bulk purchase for all the items inside your shopping cart.

For those who somehow haven’t noticed, the catalog avatar shop marketplace now has a feature where you can add items to a cart and purchase them all at once.

Anyway, what I’m trying to do is somehow get the contents of a user’s shopping cart using their ID. Is that possible? And if so, how can I do it?

Looking at the MarketplaceService documentation, it doesn’t seem like this is possible yet.